<template>
    <el-container class="home-container">
<!-- 头部区域 -->
      <el-header>
        <div>
          <img src="../assets/heima.png" alt="#">
          <span>电商后台管理系统</span>
        </div>
        <el-button type="info" @click="logout">退出</el-button>
      </el-header>
<!-- 页面主体区域 -->
      <el-container>
<!-- 侧边栏 -->
        <el-aside :width="isCollapse ? '64px' : '200px'">
          <div class="toggle-button" @click="toggleCollapse">|||</div>
          <el-menu background-color="#333744" text-color="#fff" active-text-color="#409fff"
           unique-opened :collapse="isCollapse" :collapse-transition="false" router :default-active="activePath">
<!-- 侧边栏菜单 一级菜单 -->
            <el-submenu :index="item.id + ''" v-for="item in menulist" :key="item.id" >
              <!-- 一级菜单模板区 -->
              <template slot="title">
                <!-- i 图标 -->
                <i :class="iconObj[item.id]"></i>
                <span class="sname">{{item.authName}}</span>
              </template>

              <!-- 二级菜单区 -->
              <el-menu-item :index="'/'+ subItem.path" v-for="subItem in item.children" :key="subItem.id"
                            @click="saveNavState('/'+ subItem.path)">
                <template slot="title">
                  <i class="el-icon-menu"></i>
                  <span>{{subItem.authName}}</span>
                </template>
              </el-menu-item>
            </el-submenu>
          </el-menu>
        </el-aside>
<!-- 右侧内容主体 -->
        <el-main>
          <router-view></router-view>
        </el-main>
      </el-container>
    </el-container>
</template>

<script>
export default {
  data () {
    return {
      /* 左侧菜单数据 */
      menulist: [],
      iconObj: {
        125: 'iconfont icon-users',
        103: 'iconfont icon-tijikongjian',
        101: 'iconfont icon-shangpin',
        102: 'iconfont icon-danju',
        145: 'iconfont icon-baobiao'
      },
      isCollapse: false,
      activePath: ''
    }
  },
  created () {
    this.getMenuList()
    window.sessionStorage.getItem('activePath')
  },
  methods: {
    logout: function () {
      window.sessionStorage.clear()
      this.$router.push('/login')
    },
    /* 获取所有菜单数据 */
    getMenuList: async function () {
      const { data: res } = await this.$http.get('/menus')
      if (res.meta.status !== 200) return this.$message.error(res.meta.msg)
      this.menulist = res.data
    },
    toggleCollapse: function () {
      this.isCollapse = !this.isCollapse
    },
    /* 保存链接的激活状态到sessionStorage */
    saveNavState: function (activePath) {
      /* window.sessionStorage.setItem('activePath', activePath) */
      this.activePath = activePath
    }
  }
}
</script>

<style lang="less" scoped>
/* scoped 防止样式直接的冲突 */
  .home-container {
    height: 100%;
  }
  .el-header {
    display: flex;
    justify-content: space-between;
    background-color: #373d41;
    padding-left: 0;
    align-items: center;
    font-size: 20px;
    color: #fff;
    >div {
      display: flex;
      align-items: center;
      >span {
        margin-left: 15px;
      }
    }
  }
  .el-aside {
    background-color: #333744;
    .el-menu {
      border-right: 0;
    }
  }
  .sname {
    margin-left: 6px;
  }
  .toggle-button {
    background-color: #4A5064;
    line-height: 24px;
    text-align: center;
    font-size: 12px;
    color: #fff;
    cursor: pointer;
    /* 字间距 */
    letter-spacing: 0.2em;
  }
  .el-main {
    background-color: #eaedf1;
  }
</style>
